Include the project role of a request token or user in project API

[ikhoon]

Motivation:

I think it is necessary to filter projects to which users belong or display their roles on the screen.

Currently, user information can't be obtained from /api/v1/projects API. So we need to call /api/v1/projects/${projectName} to get the metadata. That means 20 API calls should be made to list 20 projects in /app/projects. It will cause additional loads to servers and increase page loading time.

To resolve the N+1 query problem, I propose to add the role of a requested user to ProjectDto.

Modifications:

• Add RepositoryListener abstraction that can be continuously updated when a new change is pushed to a Repository. Repository.watch() has a similar function but it can be updated only once.
• Add ProjectMetadata to DefaultProject and use RepositoryListener to update ProjectMetadata in a project when new changes are made in metadata.json
• Expose user roles on the Projects page of the new web application.
• Refactor ControlPlanePlugin with RepositoryListener to simply the code.
• Miscellaneous) Show a loading indicator when a page is loading.

Result:

• The project role of a request token or user is now exposed in the project API.
• Users can see their roles on the projects page.
• Users can filter projects by their roles on the project page.

[ikhoon]